Effectiveness of Column-Type Two-Stage Constructed Wetlands for Simultaneous Removal of Organic Compounds and Heavy Metals Focusing on the Impact of Feeding Modes and Hydraulic Retention Time

DOI Web Site Web Site 34 References
  • GHAJU SHRESTHA RAJANI
    Division of Sustainable Energy and Environmental Engineering, Osaka University
  • INOUE DAISUKE
    Division of Sustainable Energy and Environmental Engineering, Osaka University
  • IKE MICHIHIKO
    Division of Sustainable Energy and Environmental Engineering, Osaka University

Bibliographic Information

Other Title
  • 通水方式と流入負荷量に着目したカラム型二段人工湿地システムの有機物及び重金属類の同時除去に対する有効性の検討

Search this article

Abstract

<p>Synthetic landfill leachate containing phenolic compounds (phenol and bisphenol A) and heavy metals (chromium (Cr) and manganese (Mn)) at 30 mg/L each were treated using column-type two-stage constructed wetland (CW) systems which were compiled with gravel and activated carbon as the substrate. Four types of CWs with and without planting common reeds and with two feeding modes (continuous and batch feeding modes) were operated for 96 d with varying hydraulic retention times (HRTs) of 5, 3, 2, and 1 d. Longer HRT (i.e., 5 d) was required for efficient removal of NH4－N, Cr, and Mn. The removal of NH4－N was higher in continuous-feed CWs, whereas batch-feed CWs were effective in the removal of heavy metals. Chemical oxygen demand and phenol could be removed efficiently, irrespective of vegetation, feeding mode, and HRT, which indicated the importance of substrate selection. By contrast, the adsorption onto the substrate as well as aerobic degradation by microorganisms in the presence of sufficient dissolved oxygen were likely significant on the removal of BPA. This study demonstrated the effectiveness of column-type two-stage CWs, and the distinct impact of feeding mode and HRT in the treatment of pollutants with different physical and chemical properties.</p>

Journal

References(34)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top